Combustion characteristics of biodiesel with different dimethyl ether blending strategies

•Kinetic differences of DME/BD blending combustion were explored by flame modeling.•DME is oxidized in an identified flame region with a higher temperature than MD.•Fuel-side DME premixing can prompt MD dehydrogenation by changing fuel/air ratio.•Air-side DME premixing increases flame temperature to...

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Bibliographic Details
Published in:Fuel (Guildford) 2023-01, Vol.332, p.126078, Article 126078
Main Authors: Luo, Yi, He, Yituan, Liu, Chunzhi, Liao, Shiyong
Format: Article
Language:English
Subjects:
Bio-diesel
Counterflow flame
Dimethyl ether
Flame structure
Heat release rate
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Summary:•Kinetic differences of DME/BD blending combustion were explored by flame modeling.•DME is oxidized in an identified flame region with a higher temperature than MD.•Fuel-side DME premixing can prompt MD dehydrogenation by changing fuel/air ratio.•Air-side DME premixing increases flame temperature to change heat release routes. In this study, the effects of adding dimethyl ether (DME) on biodiesel (BD) combustion were studied through counterflow flame modeling. DME was added through two blending strategies, i.e., air-side and fuel-side blending, and methyl decanoate (MD) was used as the surrogate for BD. The profiles of the flame temperature, primarily species, and heat release rates (HRRs) after DME addition into MD were analyzed to explore the kinetic differences between pre-blending and post-blending combustion modes of BD and DME in engines. Results show that the air-side and the fuel-side additions of DME can slightly increase the peak temperature and widen the reaction zones of the flames. MD presents two distinct oxidation zones, while DME is primarily oxidized within an identified flame region with a higher temperature than MD. DME premixing on the fuel side can prompt MD dehydrogenation through enhancing H and OH formation. The flames enriched by air-side DME premixing present significant hybrid heat-release structure that depends on the fuel-side air entrainment as well. The heat-release characteristics of the non-premixed reaction zone (NPZ) of the counterflow flames with air-side DME additions suggest that the increased temperature is the main factor leading to the change of heat-release reaction routes of the flames.
ISSN:0016-2361
DOI:10.1016/j.fuel.2022.126078